The Red Star is the name given to a planet in the Rukbat system with an unusual orbit. The Red Star has a comet-like trajectory, piercing the Oort Cloud at its apogee, and approaching Pern during its perigee. It drags with it material from the Oort Cloud, including the dreaded Thread.

The AIVAS initiated a project in the Ninth Pass to alter the Red Star's orbit sufficiently to bring an end to Thread, though the current Pass would continue until its natural end.

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